Brake-shoe



F. T. VD'lCKlnlSQrvl.

BRAKssHoE.

APPLICATION FILED FEB. 15. 1909- RENEWED FEB. 10.191?.

1,308,402. Patented July 1, 1919. I zsnEeTs-SHEET 1.

.WITNESSES THE COLUMBIA PLANUQRAPM C0.. WASHINGTON, D. c.

F. T. DICKINSON. BRAKE SHOE.'

APPLICATION FILED FEB. I5, I909. RENEWED FEB. 10,1917.

I ,$08,402. Patented July 1, 1919.

Z SHEETS-SHEET 2.

UNTTED sTATEs VPATENT onmoit. N

FRANK T. DICKINSON, OF TOLEDO, OI-IO.

y BRAKE-SHOE.

To all whom t may concern.'

Be it known that I, FRANK T. DIoKINsoN, a `citizen of the` UnitedStates, residing at Toledo, in the county of Lucas and State of Ohio,have invented certain new and useful Improvements in Brake-Shoes, ofwhich the following is a specification. y

This invention relates to `brake shoes and particularly those types ofbrake shoes `or wearing blocks .which areused `on the brakes of railwaycars and locomotives, and especially to such types of those brake shoes`as are provided with steel reinforcing backs and inserts cast into thewearing face of the shoe at the time it is poured. The principalobjectsof the present invention are the provisionof akey lug of improved formfor attaching the shoe to the brakehead; the provision of an integrallug which may notbe detached from the body of the shoe or thereinforcing members without destruction of the continuity of the lug orthe parts with which it has engagement, to the end that the shoe maynotbecome disengaged from the head and thereby cause derailment of the carto which it is applied; the `provision ofan attaching lug which will berigid and resist bothlongitudinal and transverse stressesl received inshipping and in service, and which has means for guidingthe passage ofthe brake shoe key therethrough, and the provision lof a filler blockwhich will prevent the flow of the metal of the body of theshoe up intothe lug` at the time of casting, all so arranged that ashoe embodying myinvention may be manufactured more inexpensively than in other ways at`present known to me, and may beV applied tof a brake head with greaterfacilityand accuracy and `wlth less danger of canting or othermisplacement which causes the shoe to wear nnevenly, break prematurelyand hence be `uneconomical and ineiiicient in operation; the provisionof improved forms of inserts which may be either harder or softer thanthe metal of `thecast body of the shoe, or alternately both, wherebyboth fthe `frictional and the wearing qualities of theshoe may beregulated with nicety andl shoes of any degree of hardness produced withaccuracy `by varying thequality or number of inserts applied to thewearing face thereof` i The above together with such otherobjects aswill hereinafter appearand further Specification of Letters Patent. i iPatmtgd July 1, 1919. Application led February 1.5, 1909, Serial No.477,859.` IRenewed February 10, 1917.

ofthe inserts appearing in Figs. 1` and 2.

Fig. 4 is a transverse section of the shoe illustrated in Figs. 1 and 2.1 y Fig. 5 is a perspective view of the attachingl'lug shownlinsectionin Fig. 1.

Fig. 6 is a perspective view of the filler block used for reinforcingthe lug of Fig.

5, and of Figs?, 8, 9, 10 and 12, which figsenai no. 147,930.

ures illustrate modifications in the form of H the lug shown in Fig. 5.

Fig. 11 is a.` plan view of a stamping from which the lug of Fig. 12 isformed.

Referring to Figs. 1 to a it will be observed that in carrying out myinvention I provide `the-usual castfbody portion or wearing face 14 andfor the purpose of reinforcing the' shoe, I provide the body portionthereof at the back with one or more strengthening `members such forexample as the flat straps`15,`16 and 17, which I preferably providewith rounded edges 18 and 19 in order to insure a firmer engagement withthe body of the shoe, which straps are here shown as provided with endportions of greater breadth than the intermediate portions thereof inorder that no part ofthe body `ofthe shoe maybecome disengagedfromsuch'straps in the event of the breakage` ofsuch body.` The wideningof the ends of ithestraps may be accomplished by slitting asindicated at20 and 21 and spreading `the opposite portions 22 and 23, and 24 and 25,or in other ways which will readilyoccurto those who are skilled in theart;

p In order to produce a shoeof maximum longevity` and atthe sametimeonewhich is of the highest frictionalpowers, I have provided thearrangement of inserts illustrated in Figs. 1 to t in preferred form,wherein I make use of steel, wroughtiron,

"or other hard metal blocks 26 in order to retard the wearing away ofthe frictional face of the shoe, and for wheel dressing and other wellknown purposes, and alternately therebetween blocks of gray iron, Castmetal, or other comparatively soft substances of a highly frictionalnature.

In practice I nd it most convenient in the manufacture of my improvedshoes to place in one half of the mold in which the shoes are to be casta chill block 29, upon which I place the blocks 26 and 27 mountedalternately upon a doubled wire 30, (see Fig. 3), which may then betwisted by the pin 31 until the blocks assume the position indicatedmost clearly, in Fig. 1.

It will be observed further from Fig. 3 that the'several elements of oneof the series of blocks 26 and 27, preferably the cast blocks 27, areprovided with projections such as illustrated at 82, 33, 84 and 35,which I have found useful to make of substantially the same width as theblock, in order to space the several members of the two Series asufficient distance from eachother for the purpose to be now described.

This procedure. and arrangement of parts serves a two fold purpose,viz., as the cast metal of the body of the shoe 14 iiows between theseveral blocks 26 and 27, as indicated at 28, it comes into contact withthe chill block 29 and is hardened to a degree intermediate between thatof the frictional blocks 26 and Athe dressing blocksv27, and at the sametime all of the blocks 26 and 27 are tied together in the cast metal 28by the wire 30.

It will thus be seen that not only will it be impossible for any of theinserts 26 and 27 to become disengaged from the body of the shoe anddrop out of it, but also that there is no sharp line of demarcationbetween the hard and soft portions of the wearing face, as theintermediate portions 28 tend to blend one into the other gradually, andscoring of the tread of the wheel to which the shoe is applied isthereby avoided.

By reference to Figs. 2 and 4, it will be noted that my improved formsof inserts and means for fixing them in the cast metal ofthe shoe isequally adaptable to the flange typev of shoe as to the plain or balltypes, 36 being the harder inserts and 37 the softer inserts, which arebrought into position by a wire as illustrated in Fig. 3, upon a chillblock 39, for the purposes above described.

In Fig. 5, I have shown a perspective view of the attaching lugillustrated at 40 in Fig. 1, and in Fig. 6 a like view of the fillerblock 41, which I use for the purpose of reinforcing and stiffening thelug 40 and to avoid the necessity of using cores for preventing the castmetal of the body of the shoe from entering and filling the lug at thetime of pouring the-shoe.

It will be apparent that by virtue of the provision of the said fillerblock 41, and of the depressed portion 42 of the top of the said lug 40not only is the brake shoe key more readily passed through the key-wayin such lug, but it also finds a much firmer seat therein.

In Fig. 7 I have illustrated a modified form of lug which may be used inshoes where rods are found desirable in place of straps, or where noreinforcement at all is used but reliance is placed upon the pas sage ofthe cast metal of the body of the shoe through the apertures 48, 44 and45 instead of the straps 16 and 17 through apertures such as 46 and 47.This type of lug may be cut away or dovetailed as indicated at 48, 49and 50, in order to give further en gagement with the cast metal of thebody of the shoe, although it is obvious that the reinforcing fillerblocks 41 may also be utilized if desirable.

In Figs. 8, 9 and 10 I have illustrated further modiiications in theform of the depressed portions 42, and in Fig. 11 a blank from which thelug of Fig. 12 may be formed without euttingaway the blank as indicatedat 51 and 52 in Fig. 5 or as indicated in the structures illustrated inFigs. 7 to 10.

It will be apparent to those who are skilled in the art that othermodifications of my inventions may be designed for the purposes aboveset forth.

Having thus described my invention and illustrated its uses, what Iclaim as new and desire to secure by Letters Patent is the following:

1. In combination with a hanger and its connectiiw key, a brake shoehaving a stiffening back, a body of cast metal and a separate attachinglug fixed in said body and of box-like form, and a reinforce for saidlug.

2. In combination with a brake shoe comprising a wearing face and areinforcing back embodied therein, a separate attaching 110 lug of boxlike form engaging said wearing face and back.

3. In a brake shoe, a unitary wrought metal attaching lug, comprisingtop, side and end portions, said side and end portions 115 beingseparate but approximately contiguous, and said top portion beingprovided with a depressed bearing surface for the attaching key,substantially as described.

., 4. In a brake shoe, an attaching lug hav- 120 ing top, sides andends, a key-way through said sides for receiving the brake shoe key anda depression in sai top for guiding the key through the key-way.

5. In a brake shoe, in combination, a body 125 portion, an attaching lugfixed in said body and a solid reinforcing filler block in saidattaching lug.

6. In a brake shoe, in combination with a body portion, an attaching lugfixed in said 130 body and having a key-Way and a reinforcing filler insaid attaching lug between said key-way and body portion. i

7. In a brake shoe, in combination, a bod portion, a wrought metalattaching lug of box like form and a solid filler block for reinforcingsaid lug.`

8. In a brake shoe, a body portion, a separate attaching lug fixed insaid body portion, a at strap passed through said lug and a filler blockfor reinforcing and stii'- ening said lug. v

9. In a brake shoe, a body portion, a separate attaching lug fixed insaid body portion, a flat strap passed through said lug and a fillerblock for reinforcin and stiening said lug, the top portion o said lugbeing depressed.`

l0. In combination with a hanger and its connecting key, a brake shoehaving a lug of sheet metal fixed to the back of said shoe forsupporting said shoe through said key and having its top depressedthereby formfor supporting said shoe through said keyl and having itstop depressed and flattened thereby forming an inwardly extending earingthereon adapted to bear upon said In testimony whereof I have hereuntosigned my name in the presence of the subscribed witnesses.

FRANK T. DICKINSON.

Witnesses:

PAUL CARPENTER, Gmo. C.` DAvIsoN.

Uopies of this patent may be obtained for vefcents each, by addressing"the Commissioner of Patents.

Washington, D. G. n

